Population densities of total and melanin-producing actinomycetes were monitored in plots planted to the scab-susceptible cultivar Chippewa or the resistant cultivar Superior, and in fallow control plots. Fewer than 6% of the isolates of S. scabies tested were pathogenic. Populations of actinomycetes in soils planted to potato, in potato rhizospheres, and on tuber surfaces generally increased during each growing season, but populations in fallow soil remained constant or decreased
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Anthony P. Keinath (1989) studied this question.